This post intends to provide an explanation toward user's confusion regarding the value of the data resulting from Monitor.

Link Utilization data (data resulted from Monitor) are based on information collected from SNMP polling, and represents the actual bandwidth usage at the time. Bandwidth percentage is calculated based on the value of the 'bandwidth' command or default value if the command is not set on the interface. You can move your mouse over the device to see bandwidth configuration placed on the device.

If your bandwidth value is still not correct, use 'Interface Info' (Right click device in Workspace Pane and select Device Setting) to verify the bandwidth and restart the Monitor function.

I have noticed that the utilization on monitored interfaces over 100mbps (aka GE, oc12... ) consistantly report the untilization way under the actual when the utilization gets much above 100mbps. For example, on a GE interface running at about 90mbps, monitoring seems to be generally accurate and reports utilization of about 9%, but when the link is pushing 600mbps monitoring reports utilizaition in the mid teens (eg about 15%) when it should be 60%.

I have noticed that the utilization on monitored interfaces over 100mbps (aka GE, oc12... ) consistantly report the untilization way under the actual when the utilization gets much above 100mbps. For example, on a GE interface running at about 90mbps, monitoring seems to be generally accurate and reports utilization of about 9%, but when the link is pushing 600mbps monitoring reports utilizaition in the mid teens (eg about 15%) when it should be 60%.

We are trying to repeat this in the lab... (a bit challenge to create 600 mbps traffic)

Did you spot this a few times? Any information along the line of setup would be very helpful...